|  |  | 
 |  |  | import java.util.Iterator; | 
 |  |  | import java.util.List; | 
 |  |  | import java.util.Optional; | 
 |  |  | import java.util.concurrent.ThreadLocalRandom; | 
 |  |  | import java.util.function.BiConsumer; | 
 |  |  | import java.util.function.Function; | 
 |  |  | import java.util.Map; | 
 |  |  | 
 |  |  |         return processed; | 
 |  |  |     } | 
 |  |  |  | 
 |  |  |     public static String randomNumbers(int length) { | 
 |  |  |         String baseString = "0123456789"; | 
 |  |  |  | 
 |  |  |         if (length < 1) { | 
 |  |  |             length = 1; | 
 |  |  |         } | 
 |  |  |  | 
 |  |  |         StringBuilder sb = new StringBuilder(length); | 
 |  |  |         int baseLength = baseString.length(); | 
 |  |  |  | 
 |  |  |         for(int i = 0; i < length; ++i) { | 
 |  |  |             int number = ThreadLocalRandom.current().nextInt(baseLength); | 
 |  |  |             sb.append(baseString.charAt(number)); | 
 |  |  |         } | 
 |  |  |  | 
 |  |  |         return sb.toString(); | 
 |  |  |     } | 
 |  |  |  | 
 |  |  | } |